1202135581 has 2 divisors, whose sum is σ = 1202135582. Its totient is φ = 1202135580.

The previous prime is 1202135533. The next prime is 1202135593. The reversal of 1202135581 is 1855312021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1160015481 + 42120100 = 34059^2 + 6490^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202135581 - 2¹³ = 1202127389 is a prime.

It is a super-2 number, since 2×1202135581² = 2890259910212415122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1202135531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601067790 + 601067791.

It is an arithmetic number, because the mean of its divisors is an integer number (601067791).

Almost surely, 2^1202135581 is an apocalyptic number.

It is an amenable number.

1202135581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1202135581 is an equidigital number, since it uses as much as digits as its factorization.

1202135581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 1202135581 is about 34671.8269060054. The cubic root of 1202135581 is about 1063.2885826650.

The spelling of 1202135581 in words is "one billion, two hundred two million, one hundred thirty-five thousand, five hundred eighty-one".